
Closes https://github.com/flutter/flutter/issues/156260. Fixes the degenerate case where you specify an unrecognized target, and it falls back to rebuilding the entire engine as if you specified nothing. In addition, added recognition of `group`.
Closes https://github.com/flutter/flutter/issues/156260. Fixes the degenerate case where you specify an unrecognized target, and it falls back to rebuilding the entire engine as if you specified nothing. In addition, added recognition of `group`.